slavapas

add_filter( 'woocommerce_billing_fields' , 'ced_remove_billing_fields' );
function ced_remove_billing_fields( $fields ) {
         unset($fields['billing_last_name']);
         return $fields;
}

add_filter( 'woocommerce_checkout_fields' , 'ced_rename_checkout_fields' );
// Change placeholder and label text
function ced_rename_checkout_fields( $fields ) {
$fields['billing']['billing_first_name']['placeholder'] = 'Name';

slavapas

function add_wc_custom_fields($fields) {
global $woocommerce;
    $countries_obj   = new WC_Countries();
    $countries   = $countries_obj->__get('countries');

     $fields['billing']['billing_first_name'] = array(
            'label' => '',
            'placeholder' => _x('First Name*', 'placeholder', 'woocommerce'),
            'required' => true,
           'class'    => array( 'form-row-first' ),